Auto Qos Voip - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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auto qos voip
auto qos voip
Use the auto qos voip interface configuration command to automatically configure quality of service
(auto-QoS) for voice over IP (VoIP) within a QoS domain. Use the no form of this command to change
the auto-QoS configuration settings to the standard QoS defaults.
Syntax Description
cisco-phone
trust
Defaults
Auto-QoS is disabled on all interfaces.
When auto-QoS is enabled, it uses the ingress packet label to categorize traffic and class of service (CoS)
packet labels and to configure the egress queues as summarized in
Table 2-1
Ingress DSCP
Ingress CoS
DiffServ
Assigned DSCP 46
Assigned CoS
CoS-to-Queue
Map
Egress Queue
1. STP = Spanning Tree Protocol
2. BPDU = bridge protocol data unit
3. DSCP = Differentiated Services Code Point
4. WRR = weighted round robin
Catalyst 3550 Multilayer Switch Command Reference
2-14
auto qos voip {cisco-phone | trust}
no auto qos voip
Identify this interface as connected to a Cisco IP phone, and automatically configure
QoS for VoIP. The QoS labels of incoming packets are trusted only when the
telephone is detected.
Identify this interface as connected to a trusted switch or router, and automatically
configure QoS for VoIP. The QoS labels of incoming packets are trusted.
Traffic Types, Ingress Packet Labels, Assigned Packet Labels, and Egress Queues
VoIP Data
Traffic Only
From Cisco IP
Phones
3
46
5
EF
5
5
Expedite
queue
VoIP Control
Traffic Only
From Cisco IP
Routing Protocol
Phones
Traffic
26
–
3
6
AF31
–
26
48
3
6
3, 6, 7
80% WRR
Chapter 2
Cisco IOS Commands
Table
2-1.
1
2
STP
BPDU
All Other
Traffic
Traffic
–
–
7
–
–
–
56
0
7
0
0, 1, 2, 4
4
20% WRR
78-11195-09
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